CN117411546B - LED communication capability evaluation method and system - Google Patents
LED communication capability evaluation method and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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Abstract
The invention provides a method and a system for evaluating LED communication capability, which are characterized in that an additional frequency response of an integrating sphere is determined, then an LED communication capability testing device based on the integrating sphere is calibrated and calibrated, a direct current bias device is controlled to couple a sweep frequency signal output by a vector network analyzer with a direct current signal and then send the coupled sweep frequency signal to a target LED, and the sweep frequency signal and the direct current signal are uniformly integrated to one place through the integrating sphere and received by a PD (potential device); controlling the PD to input signals into a vector network analyzer so as to obtain the frequency response of the target LED; according to the photoelectric conversion linear relation between the frequency response of the target LED and the PD, determining the light modulation amplitude frequency response of the light received by the PD, multiplying the light modulation amplitude frequency response by a corresponding coefficient to obtain a target light modulation amplitude frequency response, multiplying the target light modulation amplitude frequency response by a corresponding target frequency to obtain a target light modulation amplitude frequency product, and defining the light modulation amplitude frequency product at a-3 dB bandwidth frequency point as a target light modulation amplitude bandwidth product to evaluate the communication capability of the target LED.
Description
Technical Field
The invention belongs to the technical field of LED communication capability evaluation, and particularly relates to an LED communication capability evaluation method and system.
Background
The LED is an active antenna of a signal transmitting end in a visible light system, current is modulated to be luminous intensity, emitted light is received by a photodiode receiver (PD), and the PD converts the emitted light into an electric signal to complete information transmission.
The existing method for measuring the communication capability of the LED is to compare the frequency response bandwidth of the LED, and the specific method is that after a modulation signal is sent into the LED, light emitted by the LED is received by a PD (potential device) which is positioned at a certain distance in the axial direction of the LED after being transmitted in space, and the frequency response of the LED is obtained according to a signal output by the PD. However, this method only measures the light in the axial direction of the LED to determine the frequency response bandwidth of the entire LED, wherein the axial light is only a small part of the light emitted by the LED, and the light emission angles of different LEDs are different, so the result obtained in the above manner is not objective.
Specifically, the comparison frequency response bandwidth generally adopts the concept of-3 dB bandwidth in the radio frequency neighborhood, and the definition is that when the received signal strength is attenuated to half of the original signal strength, the corresponding frequency is the-3 dB bandwidth. A higher 3dB means that it can modulate a higher frequency or rate signal. However, for LEDs, since the intrinsic bandwidth of the LED is generally limited to within 10MHz due to the time constant of the internal junction resistance and junction capacitance and the lifetime of the carrier, when the LED is used for visible light communication, the LED is generally required to be matched with an equalizer to expand the available bandwidth, the equalizer is used to sacrifice the output capability of the optical power to replace the corresponding bandwidth, the decrease of the output capability of the optical power can limit the illumination capability of the LED, which is unacceptable for the LED which needs to have a certain illumination capability at the same time, so that the conventional-3 dB bandwidth is not comprehensive only from the bandwidth perspective to evaluate the communication capability of the LED, and the output optical power of the LED cannot be considered, that is, the potential expandable communication capability of the LED cannot be represented.
Disclosure of Invention
Based on this, the embodiment of the invention provides a method and a system for evaluating the communication capability of an LED, which aim to solve the problem that the communication capability of the LED is inaccurate only through-3 dB bandwidth of frequency response obtained from axial light emitted by the LED in the prior art.
A first aspect of an embodiment of the present invention provides an LED communication capability evaluation method, implemented by an LED communication capability test device, where the LED communication capability test device includes a vector network analyzer, a dc bias device electrically connected to one end of the vector network analyzer, an LED electrically connected to the dc bias device, an integrating sphere connected to an optical path of the LED, and a PD connected to an optical path of the integrating sphere, and the other end of the vector network analyzer is electrically connected to the PD, and the method includes:
a standard LED with known frequency response is connected into an LED communication capability testing device, and the LED communication capability testing device is operated to obtain target frequency response;
calculating the target frequency response and the frequency response of the standard LED, and determining the additional frequency response of the integrating sphere;
calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current biaser to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD;
controlling the PD to input signals into a vector network analyzer so as to obtain the frequency response of the target LED;
determining the light modulation amplitude frequency response of light received by the PD according to the photoelectric conversion linear relation between the frequency response of the target LED and the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED;
multiplying the target light modulation amplitude frequency response by the corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant so as to evaluate the communication capability of the target LED.
Further, in the step of calculating the target frequency response and the frequency response of the standard LED and determining the additional frequency response of the integrating sphere, the additional frequency response expression of the integrating sphere is:
；
wherein H is sphere (f) Represented as an additional frequency response of an integrating sphere, H display (f) Expressed as the target frequency response, H LED0 (f) Represented as the frequency response of a standard LED.
Further, in the step of determining the light modulation amplitude frequency response of the light received by the PD according to the linear relation between the frequency response of the target LED and the photoelectric conversion of the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation between the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED, the expression of the target light modulation amplitude frequency response of the target LED is:
；
wherein P is OMA (f) Expressed as the target light modulation amplitude frequency response, alpha is expressed as the gain of the integrating sphere to the light path, V S Expressed as sweep signal voltage, β expressed as photoelectric conversion efficiency of PD, R expressed as transimpedance amplifier gain integrated in PD, |h LED (f) The I is expressed as the frequency response amplitude, H, of the target LED LED (f) Expressed as the frequency response of the target LED, the expression of the frequency response of the target LED is:
；
wherein R is q Junction resistance, C, expressed as target LED q Expressed as target LED junction capacitance, R c Represented as series resistance inside the target LED chip, C j Expressed as parallel bond capacitance, h expressed as external quantum efficiency of the target LED, f expressed as the target frequency, k expressed as an imaginary number, I (f) expressed as a current flowing through the junction resistance of the target LED, and I (f) expressed as a total current flowing through the target LED.
Further, the step of multiplying the target light modulation amplitude frequency response by a corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is a-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as a target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is a constant, so as to evaluate the communication capability of the target LED, and the expression of the target light modulation amplitude bandwidth product is:
；
represented as-3 dB bandwidth frequency.
A second aspect of the embodiment of the present invention provides an LED communication capability evaluation system implemented by an LED communication capability test device, where the LED communication capability test device includes a vector network analyzer, a dc bias electrically connected to one end of the vector network analyzer, an LED electrically connected to the dc bias, an integrating sphere connected to an optical path of the LED, and a PD connected to an optical path of the integrating sphere, and the other end of the vector network analyzer is electrically connected to the PD, and the system includes:
the operation module is used for connecting a standard LED with a known frequency response into the LED communication capability test device and operating the LED communication capability test device to obtain a target frequency response;
the calculation module is used for calculating the target frequency response and the frequency response of the standard LED and determining the additional frequency response of the integrating sphere;
the first control module is used for calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current biaser to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the coupled sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD;
the second control module is used for controlling the PD to input signals into the vector network analyzer so as to obtain the frequency response of the target LED;
the target light modulation amplitude frequency response acquisition module is used for determining the light modulation amplitude frequency response of the light received by the PD according to the photoelectric conversion linear relation between the frequency response of the target LED and the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED;
the evaluation module is used for multiplying the target light modulation amplitude frequency response with the corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant so as to evaluate the communication capability of the target LED.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the LED communication capability assessment method as described in the first aspect.
A fourth aspect of an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the LED communication capability assessment method according to the first aspect when executing the program.
The beneficial effects of the invention are as follows: the method comprises the steps of accessing a standard LED with known frequency response into an LED communication capability testing device, and operating the LED communication capability testing device to obtain target frequency response; calculating the target frequency response and the frequency response of the standard LED, and determining the additional frequency response of the integrating sphere; calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current biaser to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD; controlling the PD to input signals into a vector network analyzer so as to obtain the frequency response of the target LED; determining the light modulation amplitude frequency response of light received by the PD according to the frequency response of the target LED and the photoelectric conversion linear relation of the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED; the method comprises the steps of multiplying a target light modulation amplitude frequency response by a corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant, the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product to evaluate the communication capacity of a target LED, specifically, the frequency response is mapped into the light modulation amplitude frequency response from the PD angle, and the light modulation amplitude frequency response of the LED is completely obtained by introducing an integrating sphere, so that the output light power and the communication bandwidth of the LED can be objectively described, in addition, the specific exchange numerical relation between the bandwidth and the light power of the LED is represented by the target light modulation amplitude frequency product, and the numerical relation is unique, and a judgment basis is provided for revealing the potential communication capacity of the LED and the communication capacity of different LEDs.
Drawings
Fig. 1 is a flowchart of an implementation of an LED communication capability evaluation method according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a LED communication capability test device;
FIG. 3 is a schematic diagram of the optical modulation amplitude frequency response of a measured LED;
FIG. 4 is a current driven equivalent model of an LED;
FIG. 5 is a graph comparing OBP of different LEDs;
fig. 6 is a schematic structural diagram of an LED communication capability evaluation system according to a second embodiment of the present invention;
fig. 7 is a block diagram of an electronic device according to a third embodiment of the present invention.
The following detailed description will be further described with reference to the above-described drawings.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The modulated electric signal is converted into an optical signal by the LED, then is transmitted in free space and then is received by the PD, and the PD converts the modulated optical signal into an electric signal again to complete information transmission. The frequency response of the LED to the signal transfer can be obtained by a Vector Network Analyzer (VNA). The LED is nonlinear in electro-optical conversion, and the output optical power of the LED is difficult to obtain directly from the driving current, and is not uniform, whereas the PD is linear in electro-optical conversion, so that from the perspective of the receiving end, the output optical power of the LED is reflected by the output current of the PD, and the optical power corresponds to the frequency response to obtain the frequency response of the light modulation amplitude of the LED, so that the frequency response of the LED to the signal and the output optical power of the LED can be displayed.
Meanwhile, in order to solve the problem that the PD can only measure axial light and the measured light power is incomplete, an integrating sphere is adopted to replace a free space, the integrating sphere can integrate light in all directions and then uniformly distribute the light in all positions of the sphere, and a part of light can reflect all output light power.
The invention is further illustrated by the following examples:
example 1
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of an LED communication capability evaluation method according to an embodiment of the present invention, where the LED communication capability evaluation method is implemented by an LED communication capability test device, and the LED communication capability test device includes a vector network analyzer, a dc bias electrically connected to one end of the vector network analyzer, an LED electrically connected to the dc bias, an integrating sphere connected to an optical path of the LED, and a PD connected to the optical path of the integrating sphere, where an input end of the integrating sphere is connected to the optical path of the LED, an output end of the integrating sphere is connected to the optical path of the PD, and the other end of the vector network analyzer is electrically connected to the PD, and referring to fig. 2, the method specifically includes steps S01 to S06.
And S01, connecting a standard LED with known frequency response into the LED communication capability testing device, and operating the LED communication capability testing device to obtain target frequency response.
It should be noted that, the integrating sphere has no discernability to the high frequency signal, i.e. the integrating sphere has a low-pass effect, and a low-pass frequency response is superimposed on the signal, so before the formal test, an LED with a known frequency response is required to be used to calibrate and calibrate the LED communication capability test device based on the integrating sphere. The method comprises the steps of placing an LED with known frequency response at one end of an integrating sphere, operating an LED communication capability testing device, comparing the LED primary frequency response with the frequency response after passing through the integrating sphere to obtain a low-pass frequency response attached to the integrating sphere, and removing the low-pass frequency response in the measuring process.
Step S02, calculating the target frequency response and the frequency response of the standard LED, and determining the additional frequency response of the integrating sphere.
Specifically, the additional frequency response expression of the integrating sphere is:
；
wherein H is sphere (f) Represented as an additional frequency response of an integrating sphere, H display (f) Expressed as the target frequency response, H LED0 (f) Represented as the frequency response of a standard LED.
And S03, calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current bias device to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the coupled sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD.
In step S04, the control PD inputs a signal to the vector network analyzer to obtain the frequency response of the target LED.
And S05, determining the light modulation amplitude frequency response of the light received by the PD according to the photoelectric conversion linear relation between the frequency response of the target LED and the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED.
In particular, since the photoelectric conversion of the PD is linear, the frequency response of the target LED can be further mapped to P OMA (f) The use of an integrating sphere ensures that P can be determined OMA (f) To characterize the complete light modulation amplitude frequency response of the LED, the expression of the target light modulation amplitude frequency response of the target LED is:
；
wherein P is OMA (f) Expressed as target optical modulation amplitude frequency response, alpha expressed as gain of integrating sphere to optical path, V S Expressed as sweep signal voltage, β expressed as photoelectric conversion efficiency of PD, R expressed as transimpedance amplifier gain integrated in PD, |h LED (f) The I is expressed as the frequency response amplitude, H, of the target LED LED (f) The frequency response of the target LED is expressed, so that the target light modulation amplitude frequency response of the target LED can be obtained, the relation between the output light power and the frequency of the LED is objectively represented, the output light power and the communication bandwidth can be measured as a reference, and the reference is shown in fig. 3, which isSchematic of the optical modulation amplitude frequency response of the measured LED.
In addition, referring to fig. 4, as a current driving equivalent model of an LED, as indicated by a first order RC characteristic in the structure of the LED, the exchange relationship between the output optical power and the bandwidth is linear, so it is further proposed to multiply the frequency response of the optical modulation amplitude by the frequency to obtain an optical modulation amplitude frequency product, where the product is approximately constant at the-3 dB point, and the constant is defined as an optical modulation amplitude bandwidth product (OBP), which provides a basis for comparing the communication capacities of different LEDs, and the expression of the frequency response of the target LED is:
；
wherein R is q Junction resistance, C, expressed as target LED q Expressed as target LED junction capacitance, R c Represented as series resistance inside the target LED chip, C j In this embodiment, the bond-generating resistor and the bond-generating inductor do not participate in the shunt, and therefore are not considered here.
Step S06, multiplying the target light modulation amplitude frequency response by the corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant so as to evaluate the communication capability of the target LED.
Specifically, the expression of the target light modulation amplitude bandwidth product is:
；
wherein,expressed as-3 dB bandwidth frequency, +.>Can be ignored->In the order of 10 -17 Left and right, therefore->And can be ignored; OBP is only associated with alpha, V S Regarding β, R, when the test conditions are consistent, these parameters are constant, and OBP can be used as a basis for comparing the communication capabilities of different LEDs, and the target optical modulation amplitude bandwidth product represents the maximum bandwidth that can be traded for when the LEDs meet the different required output optical powers, and at the same time, LEDs with larger values can sacrifice larger output optical powers for bandwidth.
Referring to fig. 5, which is a comparison graph of OBP of different LEDs, in which only the frequency response-3 dB bandwidth is considered in the prior art, it can be seen from fig. 5 that the bandwidth of LED2 is high, but the output light power is lower than that of LED1, the judgment basis is obviously not comprehensive enough only according to the-3 dB bandwidth, and the OBP of LED2 is higher than that of LED1, which is judged from the two angles of bandwidth and light power, so that LED2 can sacrifice less output light power to obtain a larger bandwidth, and a judgment basis is provided for the potential communication capability of different LEDs.
In summary, according to the method and system for evaluating LED communication capability in the above embodiments of the present invention, a standard LED with a known frequency response is connected to an LED communication capability test device, and the LED communication capability test device is operated to obtain a target frequency response; calculating the target frequency response and the frequency response of the standard LED, and determining the additional frequency response of the integrating sphere; calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current biaser to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD; controlling the PD to input signals into a vector network analyzer so as to obtain the frequency response of the target LED; determining the light modulation amplitude frequency response of light received by the PD according to the frequency response of the target LED and the photoelectric conversion linear relation of the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED; the method comprises the steps of multiplying a target light modulation amplitude frequency response by a corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant, the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product to evaluate the communication capacity of a target LED, specifically, the frequency response is mapped into the light modulation amplitude frequency response from the PD angle, and the light modulation amplitude frequency response of the LED is completely obtained by introducing an integrating sphere, so that the output light power and the communication bandwidth of the LED can be objectively described, in addition, the specific exchange numerical relation between the bandwidth and the light power of the LED is represented by the target light modulation amplitude frequency product, and the numerical relation is unique, and a judgment basis is provided for revealing the potential communication capacity of the LED and the communication capacity of different LEDs.
Example two
Referring to fig. 6, a schematic structural diagram of an LED communication capability evaluation system according to a second embodiment of the present invention is provided, where the LED communication capability evaluation system is implemented by an LED communication capability test device, and the LED communication capability test device includes a vector network analyzer, a dc bias electrically connected to one end of the vector network analyzer, an LED electrically connected to the dc bias, an integrating sphere connected to an optical path of the LED, and a PD connected to the optical path of the integrating sphere, where the other end of the vector network analyzer is electrically connected to the PD, and specifically, the LED communication capability evaluation system 200 includes:
an operation module 21, configured to access a standard LED with a known frequency response to the LED communication capability test device, and operate the LED communication capability test device to obtain a target frequency response;
the calculating module 22 is configured to calculate the target frequency response and the frequency response of the standard LED, determine an additional frequency response of the integrating sphere, and express the additional frequency response of the integrating sphere as follows:
；
wherein H is sphere (f) Represented as an additional frequency response of an integrating sphere, H display (f) Expressed as the target frequency response, H LED0 (f) The frequency response expressed as a standard LED;
the first control module 23 is configured to calibrate and calibrate the LED communication capability test device based on the integrating sphere according to the inverse of the additional frequency response, and control the dc bias device to couple the sweep frequency signal output by the vector network analyzer with the dc signal and send the coupled sweep frequency signal to the target LED, where the light emitted by the target LED in each direction is uniformly integrated into one place by the integrating sphere and received by the PD;
a second control module 24 for controlling the PD to input a signal to the vector network analyzer to obtain a frequency response of the target LED;
the target light modulation amplitude frequency response obtaining module 25 is configured to determine a light modulation amplitude frequency response of light received by the PD according to a linear relationship between the frequency response of the target LED and photoelectric conversion of the PD, and multiply the light modulation amplitude frequency response by a corresponding coefficient according to a proportional relationship between the light received by the PD and all light emitted by the target LED, so as to obtain a target light modulation amplitude frequency response of the target LED, where an expression of the target light modulation amplitude frequency response of the target LED is:
；
wherein P is OMA (f) Expressed as the target light modulation amplitude frequency response, and alpha is expressed as the integrating sphere pairGain of optical path, V S Expressed as sweep signal voltage, β expressed as photoelectric conversion efficiency of PD, R expressed as transimpedance amplifier gain integrated in PD, |h LED (f) The I is expressed as the frequency response amplitude, H, of the target LED LED (f) Expressed as the frequency response of the target LED, the expression of the frequency response of the target LED is:
；
wherein R is q Junction resistance, C, expressed as target LED q Expressed as target LED junction capacitance, R c Represented as series resistance inside the target LED chip, C j Expressed as parallel bond capacitance, h expressed as external quantum efficiency of the target LED, f expressed as the target frequency, k expressed as imaginary number, I (f) expressed as current flowing through the junction resistance of the target LED, I (f) expressed as total current flowing through the target LED;
the evaluation module 26 is configured to multiply the target optical modulation amplitude frequency response with a corresponding target frequency to obtain a target optical modulation amplitude frequency product, where the target frequency is a-3 dB bandwidth frequency, the target optical modulation amplitude frequency product is an optical modulation amplitude frequency product at a-3 dB bandwidth frequency point, and since the optical modulation amplitude frequency product at the-3 dB bandwidth frequency point is a constant, then define the optical modulation amplitude frequency product at the-3 dB bandwidth frequency point as a target optical modulation amplitude bandwidth product to evaluate the communication capability of the target LED, where the expression of the target optical modulation amplitude bandwidth product is:
；
represented as-3 dB bandwidth frequency.
Example III
In another aspect, referring to fig. 7, a block diagram of an electronic device according to a third embodiment of the present invention is provided, including a memory 20, a processor 10, and a computer program 30 stored in the memory and capable of running on the processor, where the processor 10 implements the above-mentioned method for evaluating LED communication capability when executing the computer program 30.
The processor 10 may be, among other things, a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor or other data processing chip for running program code or processing data stored in the memory 20, e.g. executing an access restriction program or the like, in some embodiments.
The memory 20 includes at least one type of readable storage medium including flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. The memory 20 may in some embodiments be an internal storage unit of the electronic device, such as a hard disk of the electronic device. The memory 20 may also be an external storage device of the electronic device in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like. Further, the memory 20 may also include both internal storage units and external storage devices of the electronic device. The memory 20 may be used not only for storing application software of an electronic device and various types of data, but also for temporarily storing data that has been output or is to be output.
It should be noted that the structure shown in fig. 7 does not constitute a limitation of the electronic device, and in other embodiments the electronic device may comprise fewer or more components than shown, or may combine certain components, or may have a different arrangement of components.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for evaluating the communication capability of an LED as described above.
Those of skill in the art will appreciate that the logic and/or steps represented in the flow diagrams or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (7)
1. The LED communication capability evaluation method is characterized by being realized by an LED communication capability test device, wherein the LED communication capability test device comprises a vector network analyzer, a direct current bias device electrically connected with one end of the vector network analyzer, an LED electrically connected with the direct current bias device, an integrating sphere connected with an LED light path and a PD connected with the integrating sphere light path, and the other end of the vector network analyzer is electrically connected with the PD, and the method comprises the following steps:
a standard LED with known frequency response is connected into an LED communication capability testing device, and the LED communication capability testing device is operated to obtain target frequency response;
calculating the target frequency response and the frequency response of the standard LED, and determining the additional frequency response of the integrating sphere;
calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current biaser to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD;
controlling the PD to input signals into a vector network analyzer so as to obtain the frequency response of the target LED;
determining the light modulation amplitude frequency response of light received by the PD according to the photoelectric conversion linear relation between the frequency response of the target LED and the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED;
multiplying the target light modulation amplitude frequency response by the corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant so as to evaluate the communication capability of the target LED.
2. The LED communication ability evaluation method according to claim 1, wherein in the step of calculating the target frequency response and the frequency response of the standard LED to determine the additional frequency response of the integrating sphere, the additional frequency response expression of the integrating sphere is:
；
wherein H is sphere (f) Represented as an additional frequency response of an integrating sphere, H display (f) Expressed as the target frequency response, H LED0 (f) Represented as the frequency response of a standard LED.
3. The method for evaluating LED communication capability according to claim 2, wherein in the step of determining the light modulation amplitude frequency response of the light received by the PD according to the linear relation between the frequency response of the target LED and the photoelectric conversion of the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation between the light received by the PD and all the light emitted by the target LED, the expression of the target light modulation amplitude frequency response of the target LED is:
；
wherein P is OMA (f) Expressed as the target light modulation amplitude frequency response, alpha is expressed as the gain of the integrating sphere to the light path, V S Expressed as sweep signal voltage, β expressed as photoelectric conversion efficiency of PD, R expressed as transimpedance amplifier gain integrated in PD, |h LED (f) The I is expressed as the frequency response amplitude, H, of the target LED LED (f) Expressed as the frequency response of the target LED, the expression of the frequency response of the target LED is:
；
wherein R is q Junction resistance, C, expressed as target LED q Expressed as target LED junction capacitance, R c Represented as series resistance inside the target LED chip, C j Expressed as parallel bond capacitance, h expressed as external quantum efficiency of the target LED, f expressed as the target frequency, k expressed as an imaginary number, I (f) expressed as a current flowing through the junction resistance of the target LED, and I (f) expressed as a total current flowing through the target LED.
4. The method for evaluating the communication capability of an LED according to claim 3, wherein the step of multiplying the target light modulation amplitude frequency response by the corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is a-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as a target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant, and the expression of the target light modulation amplitude bandwidth product is:
；
represented as-3 dB bandwidth frequency.
5. The utility model provides a LED communication ability evaluation system which characterized in that is realized through LED communication ability testing arrangement, LED communication ability testing arrangement includes vector network analyzer, with vector network analyzer one end electric connection's direct current biaser, with direct current biaser electric connection's LED, with the integrating sphere that LED light path is connected, and with the PD that integrating sphere light path is connected, wherein, vector network analyzer's the other end and PD electric connection, the system includes:
the operation module is used for connecting a standard LED with a known frequency response into the LED communication capability test device and operating the LED communication capability test device to obtain a target frequency response;
the calculation module is used for calculating the target frequency response and the frequency response of the standard LED and determining the additional frequency response of the integrating sphere;
the first control module is used for calibrating and calibrating the LED communication capability testing device based on the integrating sphere according to the reciprocal of the additional frequency response, controlling the direct current biaser to couple the sweep frequency signal output by the vector network analyzer with the direct current signal and then send the coupled sweep frequency signal to the target LED, and uniformly integrating the light emitted by the target LED in all directions to one place through the integrating sphere and receiving the light by the PD;
the second control module is used for controlling the PD to input signals into the vector network analyzer so as to obtain the frequency response of the target LED;
the target light modulation amplitude frequency response acquisition module is used for determining the light modulation amplitude frequency response of the light received by the PD according to the photoelectric conversion linear relation between the frequency response of the target LED and the PD, and multiplying the light modulation amplitude frequency response by a corresponding coefficient according to the proportional relation formed by the light received by the PD and all the light emitted by the target LED to obtain the target light modulation amplitude frequency response of the target LED;
the evaluation module is used for multiplying the target light modulation amplitude frequency response with the corresponding target frequency to obtain a target light modulation amplitude frequency product, wherein the target frequency is-3 dB bandwidth frequency, the target light modulation amplitude frequency product is a light modulation amplitude frequency product at a-3 dB bandwidth frequency point, and the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is defined as the target light modulation amplitude bandwidth product after the light modulation amplitude frequency product at the-3 dB bandwidth frequency point is constant so as to evaluate the communication capability of the target LED.
6. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the LED communication capability assessment method according to any one of claims 1 to 4.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the LED communication capability assessment method according to any one of claims 1-4 when executing the program.
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